DM7490A datasheet(2/5 Pages) FAIRCHILD | Decade and Binary Counters

Nombre de pieza

Descripción

DM7490A

Decade and Binary Counters ( 5 Page)

FAIRCHILD

2 page

www.fairchildsemi.com

Function Tables

BCD Count Sequence (Note 1)

BCD Bi-Quinary (5-2) (Note 2)

Reset/Count Function Table

= HIGH Level

= LOW Level

= Don’t Care

Note 1: Output QA is connected to input B for BCD count.

Note 2: Output QD is connected to input A for bi-quinary count

Logic Diagram

The J and K inputs shown without connection are for reference only and

are functionally at a HIGH level.

Count

Outputs

LLL

Count

Outputs

LLL

Reset Inputs

Outputs

R0(1)

R0(2)

R9(1)

R9(2)

LLLL

COUNT

1 2 3 4 5

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